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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A355258 a(n) = n! * [x^n] (1 - x)*log((1 - x)/(1 - 2*x)).

Table of values

n a(n)
0 0
1 1
2 1
3 5
4 34
5 294
6 3096
7 38520
8 553680
9 9036720
10 165191040
11 3344664960
12 74321452800
13 1798531257600
14 47088252288000
15 1326311841254400
16 39993302622873600
17 1285497518393088000
18 43878291581988864000
19 1585102883250991104000
20 60420385100090695680000
21 2423528644964637450240000

List of values

[0, 1, 1, 5, 34, 294, 3096, 38520, 553680, 9036720, 165191040, 3344664960, 74321452800, 1798531257600, 47088252288000, 1326311841254400, 39993302622873600, 1285497518393088000, 43878291581988864000, 1585102883250991104000, 60420385100090695680000, 2423528644964637450240000]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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